How to Report Feedback:
(1) File a bug in Bugzilla. *Note in the comment if it is a regression from a previous release. Things to remember when filing a bug:
(a) Always include the Build ID that you tested on. If you type about: in the URL bar, this will give you the Build ID.
(b) Always include clear Steps to Reproduce the bug
(c) Always check to see if your bug has already been filed.
(d) Use the regression keyword if it indeed a regression from a previous release.
(e) If you happen to crash, please submit your crash information! This helps us continually improve the product. Please also include the Breakpad Crash ID in the bug. You can get the crash ID by typing about:crashes in the URL bar.
(f) If you tend to run with lots of extensions, try starting Firefox in Safe Mode before filing to bug to see if the problem persists.

(2) If you don’t wish to file a bug, report issues through the Firefox Feedback button, http://feedback.mozilla.org or through the mozilla.feedback.firefox.prerelease newsgroup (also available on Google Groups). However, we prefer bugs as feedback is easier to track.

Thanks in advance to all of you for helping test Firefox and making it the browser of choice for millions of people all over the world!

Testing of Nightly builds is a very important QA task and helps us track down regression bugs early.

This is essential to ensuring quality releases of Firefox and Firefox Mobile and we are very thankful for your work (testing, filing bugs, checking regression ranges). Our Firefox Community rocks!

To assist you better with Mobile nightly build testing and to inform you about current focus areas where Mozilla QA is working on (for example important landings of current features) we have created a new mailing lists especially for Mobile User of our Firefox Mobile Nightly Builds: